Let’s put 450 million bullets in perspective…
In typical 50 round packaging this quantity by volume would fill about 9,500 ten wheel dump trucks, the large 15 cubic yard dump trucks you would typically see on a construction site.
If all the bullets were shipped in one delivery the line of dump trucks, patiently waiting bumper to bumper at the gate, would stretch about 52 miles.
Don’t worry...
Knowing TSA, they probably forgot to order the casings, propellant, and primers.